Brain scanning is very expensive and some people believe that we are over-scanning head injuries and it is just a waste of time and money. do you agree or disagree? why?

No, missing any injury to the brain can cause majour medical complications or even death. It is necessary to take full measures of head injury to prevent the intensity of the injury from becoming worse. Missing anything wrong with a patient's brain could lead to serious brain damage or cost the patient's life, sometimes resulting in a lawsuit towards the attending medical professionals due to "lack of care." 

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The answer would be a true statement